I was wondering, since blogs use entirely different coding and setups as
websites, if HTTrack could also work to download a backup of a Tumblr blog to
the local hard drive? Unlike Blogspot and wordpress.com, Tumblr does not yet
have its own backup system.

I understand HTTrack downloads sites entirely and follows internal link
structure (random example: www.rsca.be would not only copy the main page but
every page within that website such as www.rsca.be/stadium.html - again random
example). Would such thing work for blogs too?
Imagine you want to make a copy of (random example)
<http://loveyourchaos.tumblr.com/> ; would HTTrack copy the older posts that
fell off the homepage (page 1 / 5781 ; a good backup requires to back up all
5781 pages and their blog entries and posts) and would it also copy the static
pages of the blog (eg <http://loveyourchaos.tumblr.com/about> ) ?
Thanks for feedback. Very much appreciated.